添加CarPlay UI [英] Adding a CarPlay UI

问题描述

我正在开发当前的iPhone音频应用，以在CarPlay中获得支持.我已经获得了Apple的批准，并获得了开发权利，并观看了视频为CarPlay启用您的应用"( https://developer.apple.com/videos/play/wwdc2017/719/).在视频中，有一段Swift代码演示了如何添加CarPlay UI:

I am working on my current iPhone audio app to be supported in CarPlay. I already got approved by Apple and received the development entitlement, and watched the video "Enabling Your App for CarPlay"(https://developer.apple.com/videos/play/wwdc2017/719/). In the video there is a piece of Swift code demonstrating how to add CarPlay UI:

func updateCarWindow()  
{  
    guard let screen = UIScreen.screens.first(where: 
    { $0.traitCollection.userInterfaceIdiom == .carPlay })  
    else  
    {  
        // CarPlay is not connected  
        self.carWindow = nil;  
        return  
    }  

    // CarPlay is connected  
    let carWindow = UIWindow(frame: screen.bounds)  
    carWindow.screen = screen  
    carWindow.makeKeyAndVisible()  
    carWindow.rootViewController = CarViewController(nibName: nil, bundle: nil)  
    self.carWindow = carWindow
}

我将其重新编写为Objective-C版本，如下所示:

I re-wrote it to an Objective-C version like following:

- (void) updateCarWindow  
{  
    NSArray *screenArray = [UIScreen screens];  

    for (UIScreen *screen in screenArray)  
    {        
        if (screen.traitCollection.userInterfaceIdiom == UIUserInterfaceIdiomCarPlay)  // CarPlay is connected.
        {  
            // Get the screen's bounds so that you can create a window of the correct size.  
            CGRect screenBounds = screen.bounds;  

            UIWindow *tempCarWindow = [[UIWindow alloc] initWithFrame:screenBounds];  
            self.carWindow.screen = screen;  
            [self.carWindow makeKeyAndVisible];  

            // Set the initial UI for the window.  
            UIStoryboard *storyboard = [UIStoryboard storyboardWithName:@"Main" bundle:nil];  
            UIViewController *rootViewController = [storyboard instantiateViewControllerWithIdentifier:@"VC"];  

            self.carWindow.rootViewController = rootViewController;  
            self.carWindow = tempCarWindow;  

            // Show the window.  
            self.carWindow.hidden = NO; 

            return; 
        }  
    } 

    // CarPlay is not connected.
    self.carWindow = nil; 
}  

但是我发现，无论在真实设备或模拟器上进行测试，UIScreen的属性"screens"始终返回1个元素(主屏幕).因此，当我的应用程序在模拟器或带有CarPlay系统的真实汽车上运行时，该应用程序只是空白，并显示无法连接到我的应用程序名称""(请参见下图).我的ViewController有一个简单的UILabel.

However I found that the property "screens" of UIScreen always return 1 element (the main screen), no matter when testing on a real device or simulator. So when my app is running on the simulator or a real car with CarPlay system, the app is just blank and said "Unable to connect to "My App name"" (see the image below). My ViewController has a simple UILabel though.

我的问题是:如何使我的应用程序通过CarPlay连接?也就是说，我应该如何获得具有UIUserInterfaceIdiomCarPlay习惯用法的屏幕，而不仅是主屏幕?提前谢谢.

My question is: what should I do to make my app to be connected by CarPlay? That is, how should I obtain the screen that has UIUserInterfaceIdiomCarPlay idiom, not just always the main screen? Thanks a lot in advance.

推荐答案

CarPlay音频应用由 MPPlayableContentDelegate 和

CarPlay audio apps are controlled by the MPPlayableContentManager. You are required to implement the MPPlayableContentDelegate and MPPlayableContentDatasource protocol in order to connect with CarPlay. The UI is controlled by CarPlay - all you need to do is feed it data for tabs+tables (datasource) and respond to playable items (delegate).

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